Steam stopper



FIG. 1 is a top perspective view of a steam stopper of this invention;

FIG. 2 is a bottom perspective view of the steam stopper of FIG. 1;

FIG. 3 is a top view of the steam stopper of FIG. 1;

FIG. 4 is a bottom view of the steam stopper of FIG. 1;

FIG. 5 is a side view of the steam stopper of FIG. 1, with the opposing side view being a mirror image thereof; and,

FIG. 6 is an end view of the steam stopper of FIG. 1, with the opposing end view being a mirror image thereof. 

CLAIM The ornamental design for a steam stopper, as shown and described. 